﻿using System;

class Program
{
    static void Main()
    {
        Console.WriteLine("Maximum 20 characters:");
        string text = Console.ReadLine();
        if(text.Length>20)
            Console.WriteLine("ERROR");
        if (text.Length < 20)
        {
            for (int i = text.Length; i < 20; i++)
            {
                text += "*";
            }
        }
        Console.WriteLine(text);
    }
}